GTX560 Ti 1GB (asus) or HD 7850 2GB (sapphire)

So yeah, I wanna upgrade my GPU and I have no idea whats the best card to go with.
Stopped following tech for a while now, I'll be using the card for gaming purposes and plan to setup dual monitors.
So my questions are, Which card is better? Will dual monitor setup drasticly affect my performance? Are any of these cards capble of dual monitoring?
Also I own a Corsair XH620 wat modular power supply will it have trouble running either of the cards (At the moment im using I7 2.67 GHZ, Radeon sapphire 4890)?
Sorry for the dumb questions and please answer
Tyvm!

I am running a EVGA GTX 480 on dual monitors for gaming. It takes everything I throw at it. Runs hot though. My case keeps it really cool, If you don't have a high airflow case it will get hot in there. I would go with a GTX 570 at least for gaming. GTX 480 is also still a good bang for the buck gaming card.

personally got the 560ti asus TOP edition 1gb ram (stock 900mhz), runs battlefield three on ultra (minus msaa or msdaa whatever its called) at a steady 50+ frames per second will drop a bit to forty in places, this is @full 1080p on 24" monitor, great card and im using a tx650 watt psu from corsair runs fine power draw wise , wouldnt say it will do dual monitor gaming in bf3 or that very well, single defos and normal desktop multi-screen tasking no bother. hope this helps a bit any more question just ask and i shall try to help if i can

oh and it never goes above 65*c in my case when on long games of battlefield, hardly broke a sweat on dead island at 45*c, very very good cooling for stock

The 7850 needs only one six pin connector, it uses something like 95W at load, is about 8% faster at stock than a GTX560 Ti. If it's only a choice between these two cards and the price is close then I'd recommend the 7850.

If your budget can go little more higher i would suggest sapphire 7870.
Uses the exact same cooler on 79** series, its 1ghz by default and has the best cooler solution comparing to the other brands: is silent and its effective.

Get a bigger PSU? A Phenom II 940 + 6870 didn't want to boot with a 550-watt when I tried.

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What kind of PSU? It should have handled it fine assuming it wasn't a lower end non-80Plus PSU. As for the reccomendation, I reccomend either an HD7850 or if possible an HD7870, since both are higher performing than the 560Ti and draw less power while running cooler.

What kind of PSU? It should have handled it fine assuming it wasn't a lower end non-80Plus PSU. As for the reccomendation, I reccomend either an HD7850 or if possible an HD7870, since both are higher performing than the 560Ti and draw less power while running cooler.

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The PSU may have some aging or is a dud unit if from a reputable company or is overrated by a non reputable company.

Ive had PSUs from existing machines just die after trying to power a newer machine, it doesnt bother me much as I just go and get a new one

Yeah, when I say wouldn't boot I mean no power at all, no power up at all. Sometimes it would but it would crash in the middle of loading Windows. It was a BFG power supply, but that is in my friend's computer now with a Core 2 Duo and a radeon 4850 and it works fine for him. I bought a Corsair GS800 and powered up and booted off the bat the first time.

Yeah, when I say wouldn't boot I mean no power at all, no power up at all. Sometimes it would but it would crash in the middle of loading Windows. It was a BFG power supply, but that is in my friend's computer now with a Core 2 Duo and a radeon 4850 and it works fine for him. I bought a Corsair GS800 and powered up and booted off the bat the first time.

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N Now you know why BFG no longer exists...

And Plus capacitor aging might of come into play.

I wonder if my Antec Neo HE 500 will work on such a machine... Considering I havent had the machine powered up since 2010

I'm so torn between the 7850 and the 560Ti which is ~$55 less than the 7850 and the 448 edition is ~$15 less as well. I'm still trying to weigh up whether physx is worth it for the extra power consumption.